WO2006006895A1 - Procede et dispositif dans un systeme de communication radio - Google Patents

Procede et dispositif dans un systeme de communication radio Download PDF

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Publication number
WO2006006895A1
WO2006006895A1 PCT/SE2004/001117 SE2004001117W WO2006006895A1 WO 2006006895 A1 WO2006006895 A1 WO 2006006895A1 SE 2004001117 W SE2004001117 W SE 2004001117W WO 2006006895 A1 WO2006006895 A1 WO 2006006895A1
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WO
WIPO (PCT)
Prior art keywords
transmit power
adjustment step
power adjustment
power control
radio communication
Prior art date
Application number
PCT/SE2004/001117
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English (en)
Inventor
Mats-Ola FORSLÖW
Niklas Denkert
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to PCT/SE2004/001117 priority Critical patent/WO2006006895A1/fr
Publication of WO2006006895A1 publication Critical patent/WO2006006895A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/221—TPC being performed according to specific parameters taking into account previous information or commands using past power control commands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/362—Aspects of the step size
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/12—Outer and inner loops

Definitions

  • This invention relates to the control of power levels of transmitted signals in radio communication systems. More in particular, the invention relates to a method for adjusting a transmit power control process in a mobile radio communication system, an apparatus for implementing this method as well as a mobile station, a radio communication network and a radio base station including such an apparatus.
  • transmit power control methods can be important to radio communication systems having many simultaneous transmitters because such methods reduce the mutual interference of such transmitters. For example, transmit power control is necessary to obtain high system capacity in interference limited communication systems, e.g., those that use code division multiple access (CDMA) . Depending upon the system characteristics, power control in such systems can be important for the uplink (i.e., for transmissions from a remote terminal/mobile station to the network), the downlink, (i.e., for transmissions from the network to the remote terminal/mobile station) or both.
  • CDMA code division multiple access
  • UMTS Universal Mobile Telecommunication System
  • 3GPP 3 rd Generation Partnership Project
  • power control in each direction is based on both an inner loop power control algorithm (alternatively referred to as a fast power control loop) and an outer loop power control algorithm
  • the inner loop power control is performed by the network (radio base station or Node B) frequently estimating the received Signal-to-Interference (SIR) and comparing it to a target SIR. If the estimated SIR is lower than the target SIR, the radio base station orders the mobile station to increase its transmit power. If the estimated SIR is higher than the target SIR, the base station instead orders the mobile station to decrease its transmit power. Estimating the received SIR and ordering the mobile station to increase/decrease its transmit power is performed 1500 times per second (once for each time slot) . The orders to increase/decrease the transmit power are referred to as Transmit Power Control (TPC) commands.
  • TPC Transmit Power Control
  • the outer loop power control algorithm in the uplink direction is performed to adjust the target SIR in the base station.
  • the quality usually defined as a certain target bit error rate (BER) or block error rate (BLER)
  • BER bit error rate
  • BLER block error rate
  • the quality is regularly evaluated and compared to a required quality of service. If the quality is below the required quality of service (QoS) , the target SIR is increased. If the quality is found to be above the required quality of service, the target SIR is decreased.
  • QoS quality of service
  • the evaluation of the quality is based on an average over several frames (each frame consists of 15 time slots) in order to provide reliable estimates and hence the outer loop power control is a much slower process than the inner loop power control.
  • the required quality of service would typically be different for different services.
  • Power control in the downlink direction is performed essentially as in the uplink direction, but the roles are then of course reversed, i.e. it is the mobile station that evaluates the signal from the base station and issues TPC-commands to the base station ordering it to increase/decrease its transmit power.
  • the outer loop power control being a rather slow process, it is not well suited to track fast changing requirements on the SIR which occurs in specific circumstances, e.g. in connection with compressed mode, in a UMTS system.
  • the 3GPP specifications provide for target SIR offsets and transmit power adjustment steps supplementing the basic inner loop and outer loop power control mechanisms during compressed mode.
  • US 6,564,067 discloses a method for setting a transmission quality target value for power control.
  • the method involves applying an offset to said transmission quality target in order to compensate for the effects of a compressed mode whereby transmission is interrupted during transmission gaps.
  • the offset includes components compensating for the effects of both a transmission rate increase as well as the transmission gaps themselves.
  • WO 03/076964 discloses a system and method for speed indication wherein a speed indication signal is determined from a sequence of Transmit Power Control (TPC) commands sent from a mobile station to an access point of a wireless communication network.
  • TPC Transmit Power Control
  • the problem addressed by the present invention is improving the power control process of mobile radio communication systems.
  • ⁇ general advantage of the invention is that it enables improvements of the power control process in radio communication systems.
  • a further advantage of the invention is that it enables improved power control in compressed mode. Yet another advantage of the invention, is that it affords increased robustness against inappropriate selection of transmit power adjustment step values.
  • Fig. 1 is a schematic view of an example mobile communication system in which the present invention may be advantageously employed.
  • Fig. 2 is a diagram illustrating an example scenario of target SIR and transmit power in compressed mode.
  • Fig. 3 is a flow diagram illustrating a basic method for adjusting a transmit power control process according to the invention.
  • Fig. 4 is a schematic view illustrating hardware structure relevant to a first exemplary embodiment of the invention
  • Fig. 5A-5B are flow diagrams illustrating a method according to the first exemplary embodiment of the invention.
  • Fig. 1 illustrates a non-limiting example of a communication system SYSl in which the present invention may be employed.
  • the exemplary communication system SYSl illustrated in Fig. 1 is a Universal Mobile Telecommunication System (UMTS) .
  • the communication system SYSl includes a core network CNl, a UMTS Terrestrial Radio Access Network (UTRAN) RANl and User Equipment (UE) , alternatively referred to as mobile stations (MS) .
  • UTRAN UMTS Terrestrial Radio Access Network
  • UE User Equipment
  • the core network CNl includes a Mobile services Switching Center
  • MSC Management Entity node
  • GPRS General Packet Radio Service
  • SGSN Serving GPRS Support node
  • Each of the core network nodes MSCl and SGSNl connects to the the radio access network RANl over a radio access network interface referred to as the Iu interface.
  • the radio access network RANl includes one or more radio network controllers
  • radio access network RANl the radio access network RANl of
  • Fig. 1 is shown with only one radio network controller node
  • Each radio network controller is connected to and controls a plurality of radio base stations (RBSs) .
  • RBSs radio base stations
  • Fig. 1 only illustrates a first radio base station node RBSl and a second radio base station node RBS2 connected to the radio network controller node RNCl.
  • the interface between the radio network controller RNCl and the base stations RBSl and RBS2 is referred to as the Iub interface.
  • Mobile stations such as mobile station MSl shown in Fig. 1, communicate with one or more radio base stations RBS1-RBS2 over a radio or air interface referred to as the Uu interface.
  • An operation and maintenance center OMCl provides operation and maintenance of the radio network controller RNCl and the radio base stations RBS1-RBS2 via interfaces denoted Mur and Mub respectively.
  • power control is applied both in the uplink and the downlink direction. Power control in each direction is based on both an inner loop power control algorithm (alternatively referred to as a fast power control loop) and an outer loop power control algorithm (alternatively referred to as a slow power control loop) .
  • an inner loop power control algorithm alternatively referred to as a fast power control loop
  • an outer loop power control algorithm alternatively referred to as a slow power control loop
  • the power control process in the uplink direction would be performed as follows.
  • Inner loop power control would be performed by the first radio base station RBSl frequently (for each time slot) estimating the received Signal-to-Interference ratio (SIR) and comparing it to a target SIR. Based on the result of said comparison, the first radio base station RBSl issues transmit power control (TPC) commands 101 to the mobile station MSl ordering it to increase or decrease its transmit power depending on whether the estimated SIR was below or above the target SIR.
  • TPC transmit power control
  • Outer loop power control would be performed by the radio network controller RNCl to adjust the uplink target SIR.
  • the quality usually defined as a certain target bit error rate
  • BER block error rate
  • BLER block error rate
  • the target SIR would be increased or decreased.
  • RNCl informs the first radio base station RBSl of any changes in the uplink target SIR.
  • Power control in the downlink direction would be performed essentially as in the uplink direction, but the roles are then of course reversed, i.e. it is the mobile station MSl that evaluates the signal from the first radio base station RBSl and issues TPC-commands (inner loop power control) to the first radio base station RBSl ordering it to increase/decrease its transmit power and it is also the mobile station MSl that evaluates the quality and updates the downlink SIR target (outer loop power control) if need be.
  • Compressed mode basically involves stopping the downlink transmission for a defined period of time (a transmission gap) , thus making receiver circuitry in the mobile station available for performing said measurements. Simultaneous uplink and downlink compressed mode may be applied e.g. when measuring on frequencies close to the uplink frequency.
  • the 3GPP specifications provide the following mechanisms for this purpose:
  • Operation in compressed mode has a significant effect on the power control processes.
  • the increased bit rate during compressed frames when reducing the spreading factor as well as the weaker channel coding in a transmission time interval (TTI) when applying puncturing necessitate increased target SIR.
  • Fig. 2 includes two diagrams wherein the horizontal axis of both diagrams represent time, the vertical axis of the lower diagram represents transmit power 204 (illustrated by the solid line) and the vertical axis of the upper diagram represents target SIR 203a-d (illustrated by the dashed line) .
  • Time is organized into a sequence of 10 ms frames 202a-202d, each frame consisting of 15 time slots 201.
  • Frame 202b is a compressed frame, i.e. a frame including a transmission gap
  • frame 202c is a recovery frame following the compressed frame 202b while frames 202a and 202d are normal frames preceding and following the compressed frame 202b and recovery frame 202c respectively.
  • the SIR of the received signal matches the target SIR 203a and hence the TPC command sequence during frame 202a consists of alternating orders to increase and decrease the transmit power causing the transmit power 204 to vary accordingly.
  • the target SIR and transmit power needs to be adjusted to compensate for the effects of the increased bit rate and the transmission gap in the frame. Therefore, in the beginning of the compressed frame 202b, the target SIR is increased to a new target SIR 203b by adding corresponding target SIR offsets (denoted ⁇ SIR P i LO ⁇ and DeltaSIR for the uplink in the 3GPP specifications) to the basic target SIR determined by the slow power control loop. Further, in conjunction with applying said variation of the SIR target an associated transmit power adjustment step 205a is applied to the transmit power 204.
  • the inner loop power control process issues transmit power control commands for each time slot 201 of the compressed frame 202b in order to adjust the SIR of the received signal towards the target SIR 203b.
  • the target SIR and transmit power needs to be adjusted again in order to compensate for the effects of the reduced bit rate in the recovery frame 202c as compared to the preceding compressed frame 202b and the transmission gap 206 in the preceding compressed frame 202b.
  • the target SIR offsets added for the compressed mode frame 202b are removed and instead another target SIR offset (denoted DeltaSIRafter in the 3GPP specifications) is applied, the net effect being a reduction of the target SIR 203c for the recovery frame 202c as compared to the target SIR 203b of the compressed frame 202b.
  • another target SIR offset denoted DeltaSIRafter in the 3GPP specifications
  • an associated transmit power adjustment step 205b is applied to the transmit power 204.
  • the inner loop power control process issues transmit power control commands for each time slot 201 of the recovery frame 202c in order to adjust the SIR of the received signal towards the target SIR 203c applicable in the recovery frame 202c.
  • the transmit power adjustment step and target SIR variation should be well matched so that immediately after applying said transmit power adjustment step and target SIR variation, the transmit power would be just right for providing a received SIR corresponding to the SIR target.
  • the inventors of the present invention have recognized that this is far from always the case as illustrated by the example scenario of Fig. 2.
  • the transmit power 204 increases for all time slots transmitted in the compressed frame 202b following application of the transmit power adjustment step 205a, indicating that the transmit power adjustment step 205a was insufficient to meet the target SIR value 203b of the compressed frame 202b.
  • the transmit power 204 is decreased for 5-6 time slots following application of the transmit power adjustment step 205b before leveling out, indicating that the transmit power adjustment step 205b was not sufficient to immediately reach the new target SIR value 203c of the recovery frame 202c, but still enough so as to meet the target SIR value 203c after half a frame.
  • the transmit power 204 immediately exhibits an alternating pattern of transmit power increase/decrease following transmit power adjustment step 205c, which indicates that the transmit power adjustment step 205c was just right for meeting the target SIR value 203d of- the frame 202d following the recovery frame 202c.
  • the present invention addresses the situation elaborated above, wherein transmit power adjustment steps associated with and applied in conjunction with transmission quality target variations are not always well matched with the corresponding _ _
  • Fig. 3 illustrates a basic method according to the invention for adjusting a transmit power control process in a mobile radio communication system, such as SYSl of Fig. 1, wherein transmit power is controlled by issuing power control commands indicating whether the transmit power should be increased or decreased in order to adjust towards a transmission quality target, e.g. a target SIR 203a-203d, and wherein a first transmit power adjustment step is applied in predefined circumstances.
  • a transmission quality target e.g. a target SIR 203a-203d
  • step 301 sequences of issued transmit power control commands are registered.
  • the first transmit power adjustment step is adjusted according to a predetermined rule based on transmit power control command sequences following previous instances of applying said first transmit power adjustment step.
  • the transmit power adjustment step 205a to be adjusted based on transmit power control command sequences following previous instances of applying the transmit power adjustment step 205a, i.e. TPC-sequences in previous compressed frames 202b.
  • This method may also be applied to the other transmit power adjustment steps 205b (based on TPC- sequences in previous recovery frames 202c) and 205c (based on TPC-sequences frames 202d following recovery frames) .
  • FIG. 4 A first exemplary embodiment of the invention for use in the context of the radio communication system SYSl of Fig. 1 is illustrated in Fig. 4 together with Figs. 5A-5B.
  • Fig. 4 illustrates schematically exemplary hardware elements of relevance for the invention in the first radio base station RBSl, the operation and maintenance center OMCT and mobile stations such as the mobile station MSl.
  • the first radio base station RBSl includes receiver circuitry 401 for receiving and decoding radio signals transmitted by mobile stations such as mobile station MSl, transmitter circuitry 402 for encoding and transmitting radio signals to mobile stations, a processor 403 and a memory unit 404.
  • the processor 403 receives TPC-commands 102 relating to downlink power control via the receiving circuitry 401. Based on the received TPC-commands, the processor 403 adjusts the transmit power of the transmitter circuitry 402.
  • the processor 403 further estimates the SIR of received signals, compares the estimated SIR to the applicable target SIR value and issues TPC- commands 101 relating to uplink power control to mobile stations via the transmitter circuitry 402.
  • the mobile station MSl includes receiver circuitry 411 for receiving and decoding radio signals transmitted by radio base stations such as the first radio base station RBSl, transmitter circuitry 412 for encoding and transmitting radio signals to radio base stations, a processor 413 and a memory unit 414.
  • the processor 413 receives TPC-commands 101 relating to uplink power control via the receiving circuitry 411. Based on the received TPC-commands, the processor 413 adjusts the transmit power of the transmitter circuitry 412.
  • the processor 413 further estimates the SIR of received signals, compares the estimated SIR to the applicable target SIR value and issues TPC-commands 102 relating to downlink power control to radio base stations via the transmitter circuitry 402.
  • the operation and maintenance center OMCl includes a processor 423 and a memory unit 424.
  • the power adjustment steps associated with each of the target SIR variations in compressed frames, recovery frames and frames following an recovery frame in both the uplink and downlink directions are adjusted using the invention.
  • the first radio base station RBSl registers TPC-command sequences relating to each of said frame categories in both uplink and downlink direction. For power control in the uplink direction, the first radio base station RBSl registers TPC- commands issued to mobile stations such as mobile station MSl.
  • the first radio base station RBSl instead registers TPC-commands received from mobile stations.
  • the first radio base station RBSl maintains a FRAME_CNT variable and a TPC_ACK variable in memory 404 for each different transmit power adjustment step being monitored.
  • TPC-command registration are organized in recording periods of e.g. 15 minutes. In the beginning of each recording period, all FRAME__CNT and TPC_ACK variables are initialized to zero.
  • Fig. 5A Each time a certain transmit power adjustment step is applied during a recording period, the processing steps illustrated in Fig. 5A are performed by the processor 403 in the first radio base station RBSl.
  • the FRAME_CNT variable associated with this particular transmit power adjustment step is incremented by one.
  • each TPC-command is checked to determine whether it was an order to increase or decrease the transmit power. If an increase in transmit power is ordered (an alternative INCREASE at step 502), the TPC_ACK variable associated with this particular power adjustment step is incremented by one at step 503. If a decrease of the transmit power is ordered (an alternative DECREASE at step 502), the TPC_ACK variable is decremented by one at step 504. If there are more TPC-commands to process for the frame (an alternative YES at step 505) , processing returns to step 502 where the next TPC-command is considered. Otherwise (an alternative NO at step 505) , processing of this frame is completed.
  • the data registered during the recording period is transferred to the operation and maintenance center OMCl which performs an analysis on the registered data to determine whether the power adjustment steps should be adjusted.
  • a new recording period may immediately be initiated following the end of the previous recording period.
  • Fig. 5B illustrates processing performed by the processor 423 in the operation and maintenance center OMCl to evaluate the data registered during a recording period. The same processing is performed for each set of FRAME_CNT and TPC_ACK variable associated with a specific transmit power adjustment step.
  • the FRAME_CNT variable is compared to a first threshold SAMPLE_THRESHOLD (e.g. in the order of 10 000) to check whether enough samples of TPC-command sequences have been obtained to form a reliable basis for adjusting the associated transmit power adjustment step. If to few TPC-command sequences have been registered during the recording period (an alternative NO at step 510), processing stops without adjusting the transmit power adjustment step. If enough samples of TPC-command sequences have been obtained (an alternative YES at step 510) , processing continues at step 511 where a value TPC_AVG is calculated by dividing the TPC_ACK value with FRAME_CNT.
  • a first threshold SAMPLE_THRESHOLD e.g. in the order of 10 000
  • TPC_AVG reflects the average number of increase/decrease TPC-commands in each frame following application of the transmit power adjustment step.
  • a positive TPC_AVG value indicates that there have been more TPC-commands ordering an increase of transmit power than TPC-commands ordering a decrease of transmit power, while a negative TPC_AVG value indicates the reverse proportions of increase/decrease TPC-commands.
  • the TPC_AVG value is compared to a second threshold INCREASEJTHRESHOLD. If the TPC_AVG value is above the second threshold INCREASEJTHRESHOLD (an alternative YES at step 512), the transmit power adjustment step is increased DELTA_ADJUSTMENT dB at step 513. Otherwise (an alternative NO at step 512), the TPC_AVG is compared to a third threshold DECREASEJTHRESHOLD at step 514. If the TPC_AVG value is below the third threshold DECREASEJTHRESHOLD (an alternative YES at step 512), the transmit power adjustment step is decreased DELTA_ADJUSTMENT dB at step 515.
  • the parameter DELTA_ADJUSTMENT may preferably be set equal to the size of the steps by which the transmit power is adjusted in response to the TPC-commands (e.g. typically 1 dB) .
  • INCREASEJTHRESHOLD and DECREASEJTHRESHOLD could preferably be selected so that the transmit power adjustment step is adjusted only if the TPC_AVG value indicates that the average net effect of TPC-commands per frame is an increase/decrease of transmit power by more than one step, i.e. the INCREASEJIHRESHOLD and
  • DECREASEJTHRESHOLD could be set equal to +1 and -1 respectively.
  • DECREASEJTHRESHOLD could be selected as larger than +1 and less than -1, e.g. as +/- 2.
  • the operation and maintenance center OMCl communicates said adjustment to either the first radio base station RBSl or the mobile station MSl at step 516. If the transmit power adjustment step relates to the downlink power control process, the first radio base station RBSl is informed directly of the adjustment by means of a message transmitted over the Mub interface. If the transmit power adjustment step relates to the uplink power control process, the operation and maintenance center OMCl communicates the adjustment over the Mur interface to the radio network controller RNCl which informs the mobile station MSl of the adjustment in a RRC-message (e.g. Radio Link Reconfiguration) transmitted over the Iub interface.
  • a RRC-message e.g. Radio Link Reconfiguration
  • the processor 403 and memory 404 of the first radio base station RBSl together functions as registering means for registering sequences of issued transmit power commands, while the processor 423 of the operation and maintenance center OMCl acts as adjusting means for adjusting each of the transmit power adjustment steps discussed above.
  • the corresponding processing could be performed in either the first radio base station RBSl or the radio network controller RNCl.
  • the recording period could be both considerable longer (e.g. several hours of even longer periods) or shorter than the 15 minutes used in the first exemplary embodiment.
  • By selecting an appropriate recording period length it is possible, if desired, to adapt to e.g. variations of the interference situation during a day.
  • a transmit power adjustment step is associated with and applied in conjunction with a variation of the transmission quality target (e.g. target SIR) as illustrated by the example scenario of Fig. 2.
  • a transmit power adjustment step without applying an associated variation of the transmission quality target.
  • One example of such an embodiment would be in the context of compressed mode based on higher layer scheduling, where a transmit power adjustment step could be applied, without any corresponding variation of the target SIR, in order to provide an extra power margin for fading dips that might occur while there is a break in the inner loop power control process.
  • a statistical analysis is performed by comparing an average value for the proportions of INCREASE/DECREASE TPC-commands to threshold values in order to determine if the transmit power adjustment step should remain the same, be increased or be decreased.
  • such statistical analysis could e.g. be based on the median value for the proportions of INCREASE/DECREASE TPC-commands.
  • Adjustment of a transmit power adjustment step could be implemented by means of an associated adjustment offset variable which defines how much the original transmit power adjustment step should be adjusted.
  • the variable/parameter defining the transmit power adjustment step could be modified each time an adjustment is made.
  • the invention in its first exemplary embodiment has been applied in the context of a UMTS radio communication system, the invention may of course be applied in other radio communication systems where transmit power is controlled by power control commands indicating whether the transmit power should be increased or decreased in order to adjust towards a transmission quality target and wherein a transmit power adjustment step is applied in predefined circumstances.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif permettant d'ajuster le processus de commande de puissance de transmission dans un système mobile de communication radio (SYS1). La puissance de transmission (204) est commandée au moyen d'instructions de commande de puissance (101, 102) indiquant si cette puissance doit être augmentée ou bien réduite en fonction d'une cible qualitative de transmission (203a-d) et une première opération de réglage de la puissance de transmission (205a, 205b, 205c) est exécutée dans des circonstances prédéfinies. Des séquences d'instructions de commande de puissance de transmission (101, 102) sont enregistrées (301). La première opération de réglage de puissance de transmission (205a, 205b, 205c) est ajustée (302) en fonction d'une règle prédéterminée basée sur des séquences d'instructions de commande de puissance de transmission (101, 102) à la suite de cas antérieurs d'application de la première opération de réglage de puissance de transmission (205a, 205b, 205c).
PCT/SE2004/001117 2004-07-08 2004-07-08 Procede et dispositif dans un systeme de communication radio WO2006006895A1 (fr)

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US9854519B2 (en) * 2014-01-28 2017-12-26 Mediatek Inc. Handheld device, base station and transmission control method thereof
US20150271816A1 (en) * 2014-03-21 2015-09-24 Qualcomm Incorporated Compressed mode with dch enhancements
WO2015142420A1 (fr) * 2014-03-21 2015-09-24 Qualcomm Incorporated Mode compressé ayant des améliorations de dch
CN106105341A (zh) * 2014-03-21 2016-11-09 高通股份有限公司 带有dch增强的压缩模式
KR20160135210A (ko) * 2014-03-21 2016-11-25 퀄컴 인코포레이티드 Dch 향상들을 갖는 압축 모드
CN106105341B (zh) * 2014-03-21 2020-01-03 高通股份有限公司 带有dch增强的压缩模式
US10674454B2 (en) 2014-03-21 2020-06-02 Qualcomm Incorporated Compressed mode with DCH enhancements
KR102338293B1 (ko) 2014-03-21 2021-12-09 퀄컴 인코포레이티드 Dch 향상들을 갖는 압축 모드
WO2016060767A1 (fr) * 2014-10-16 2016-04-21 Qualcomm Incorporated Ajustement de contrôle de puissance de liaison descendante basé sur la détermination d'une partie de trame perdue
US9374790B2 (en) 2014-10-16 2016-06-21 Qualcomm Incorporated Downlink power control adjustment based on lost frame portion determination
CN107079406B (zh) * 2014-10-16 2019-05-28 高通股份有限公司 基于丢失帧部分确定的下行链路功率控制调整

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